<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>
<body>
  <div>
    <input type="file" id="file"/>
    <button id="uploadBtn">上传</button>
    <button id="uploadBase64Btn">Base64上传</button>
    <button id="uploadBinaryBtn">IO上传</button>
  </div>
  
  <script src="./app.js" type="module"></script>
</body>
</html>